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Notes Measurements Describing Data
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Measurement: a type of observation, a form of data
Words You Need to Know… Measurement: a type of observation, a form of data
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Words You Need to Know… Measurement: a type of observation, a form of data Qualitative Data: descriptive observation Ex: hot, cold, heavy, light, big, blue, furry
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Words You Need to Know… Measurement: a type of observation, a form of data Qualitative Data: descriptive observation Ex: hot, cold, heavy, light, big, blue, furry Quantitative Data: numerical observation that includes both a number; measured Ex: 12 in, 13.5°C, 25kg, 17L
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Uncertainty There is uncertainty in all measurements, which is a range of possible values within the range of where the true value lies. + / - half of the smallest measurement
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Uncertainty There is uncertainty in all measurements, which is a range of possible values within the range of where the true value lies. ± half of the smallest measurement
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Well, what about the certain digits?
The “certain” digits include all numbers read directly off of the measuring device PLUS one extra estimated digit. Ex: This device is a graduated cylinder. The units are mL The proper reading should be:
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Accuracy v. Precision Accuracy: How close a measurement is to the true or accepted value Precision: How close multiple measurements are to each other Ex: Weighing a 50g mass Accurate/Precise? Accurate/Precise? 50.00g g 49.99g g 50.00g g
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An easy way to remember…
ACcurate = Correct PRecision = Reproducibility
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